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ANS-C01: Resilient Site-to-Site VPN Connectivity with Dead Peer Detection on AWS

Learn how to configure Dead Peer Detection to automatically restart failed IKE sessions and maintain uptime for AWS Site-to-Site VPNs.

Table of Contents

Question

A company has an AWS Site-to-Site VPN connection between its office and its VPC. Users report occasional failure of the connection to the application that is hosted inside the VPC. A network engineer discovers in the customer gateway logs that the Internet Key Exchange (IKE) session ends when the connection to the application fails.

What should the network engineer do to bring up the IKE session if the IKE session goes down?

A. Set the dead peer detection (DPD) timeout action to Clear. Initiate traffic from the VPC to on premises.
B. Set the dead peer detection (DPD) timeout action to Restart. Initiate traffic from on premises to the VPC.
C. Set the dead peer detection (DPD) timeout action to None. Initiate traffic from the VPC to on premises.
D. Set the dead peer detection (DPD) timeout action to Cancel. Initiate traffic from on premises to the VPC.

Answer

B. Set the dead peer detection (DPD) timeout action to Restart. Initiate traffic from on premises to the VPC.

Explanation

The solution that will resolve this issue is B:

  • Set the dead peer detection (DPD) timeout action to Restart.
  • Initiate traffic from on premises to the VPC.

This will:

  • Configure DPD to automatically restart the IKE session if it fails
  • Triggering traffic from the on-prem network to the VPC will cause DPD to detect the failed session and restart it.

The other options will not fully address the problem:

A – Clearing the session drops ongoing VPN connectivity
C – No action taken on timeout allows sessions to remain down
D – Canceling does not restart the IKE session

Setting DPD to automatically restart failed IKE sessions, and triggering traffic to initiate session monitoring from the on-prem network is the optimal approach to maintain VPN uptime.

AWS Certified Advanced Networking – Specialty ANS-C01 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the AWS Certified Advanced Networking – Specialty ANS-C01 exam and earn AWS Certified Advanced Networking – Specialty ANS-C01 certification.

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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